Isopentyl lactate was synthesis from acid and isopentyl alcohol in the presence of ferric chloride hexahydrate.在六水三氯化铁存在下可以由乳酸和异戊醇合成乳酸异戊酯.Rather than politely lobbying politicians, Gay Dignity will be making its presence...
We had kept its presence hidden with a strategically placed chair.我们用一张摆放得很巧妙的椅子将它隐藏了起来。The presence of a star is already apparent in the early film.在早期影片中已经显露出了明星相。Nobody was allowed to eat in the Empress Dowager's...
The earth's magnetosphere is at once protective and dangerous.地球的磁层既具有保护的功能，却又极其危险。This animation shows a conceptual sketch of Mercury's magnetosphere at the time of the MESSENGER flyby.这个动画是信使号探测船探测水星磁层时的模拟图.A...
Caroline joined them on the shopping expeditions.卡罗琳加入了他们的购物之旅。expeditions to the far-flung corners of the world去世界偏远地方的探险The war - chief could only give orders on military expeditions.酋帅仅仅在出征时才能发号施令....